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(No Model.)

G. H. HELVBY. VALVE GEAR CLUTCH.

No. 534,793. Patented Feb. 26, 1895.`

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Attorney GEORGE H. HELVEY, OF HAMILTON, OHIO, ASSIGNOR TO THE HOOVEN, OWENS da RENTSOHLER COMPANY, OF SAME PLACE.

vALv-GEAR CLUTCH.

SPECIFICATION forming part of Letters Patent No. 534,793, dated February 26,1895.

Application filed December 11, 1894. Serial No. 531,514. (No modell) To a/ZZ whom it may concer-7e:

Be it known that I, GEORGE H. HELVEY', of Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Valve-Gear Clutches, of which the following is a specication.

This invention pertains to improvements in devices by means of which, in steam engine Valve gear, the eccentric rod is engaged with and disengaged from the valve part which' In the drawings:1, indicates a rocker` arm, illustrated as the wrist-plate of the ordinary Oorliss valve gear; 2, the eccentric rod whose reciprocations are to oscillate the rocker-arm; 3, a cylindrical portion formed at the end of the eccentric rod and having a length equal at least to twice the stroke of the rod; 4, an exemplifying handle for oscillating the rocker-arm by hand When the eccentric rod is unclutched; 5, the pivot on which the rocker-arm oscillates; 6, a bearing formed at the` free extremity of the rockerarm with its axis parallel with that of pivot 5; 7, a journal-stud free for angular motion in the bearing 6; 8, a head formed upon the front end of journal 7 and having through it a horizontal hole fitting the cylindrical portion 3 of the eccentric rod with such freedom that the rod may slide freely in the hole; and

9, a clutch-pin removably inserted vertically through the head 8 and through a hole in the cylindrical portion of the eccentric rod.,

When pin 9 is in place then head 8 and journal 7 form in effect a journal projecting rigidly and rearwardly from the eccentric rod into engagement with bearing 6 of the rocker arm, and in this condition the reciprocation of the eccentric rod will force the rocker arm into oscillations. If pin 9 be withdrawn then the head and journal will be no lon ger locked to the eccentric rod andthe eccentric rod will be free to reciprocate through head S while the rocker-arm remains stationary, or the rocker-arm maybe oscillated by hand regardless of the eccentric rod, andby starting the pin into place in the head it will, at proper time, engage the hole in the eccentric rod and will settle down into ultimate working position, or it may be pushed down and will retain its workin g position at any working speed of the parts.

I claim as my invention*- In a valve gear clutch, the combination, substantially as set forth, of a rocker-arm having in its free end a bearing with its axis parallel to the axis of its pivot of oscillation, a journal in said bearing and provided with a head having a pair of intersecting holes in a plane at right angles to the axis of the journal, an eccentric rod having a cylindrical portion fitted to slide in one of said holes in the head and having a transverse hole adapted to register withthe other hole in the head,

and aremovablepin engaging the second hole in said head and the transverse hole in the eccentric rod.

GEORGE I-I. HELVEY. Witnesses:

J. W. SEE, SAM D. FITTON, J r. 

